#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;
class Sum
{
public:
	Sum()
	{
		_ret += _num;
		_num++;
	}
	static int ret()
	{
		return _ret;
	}
private:
	static int _num;
	static int _ret;
};

int Sum::_num = 1;
int Sum::_ret = 0;

int main()
{
	Sum arr[5];
	return 0;
}